The song the grandmother sings in the pub at the end of the film was dubbed; the actual singer was Gary Oldman's mother.
The word "fuck" and its variations are used 428 times, an average of 3.34 times per minute, a movie record at the time until it was beaten by Summer Of Sam.
Gary Oldman said in a 2014 Playboy interview that he's tired of the media claiming this film was based on his actual life and his parents. He said, "You're hearing it from the horse's mouth. That character is not my dad. My mother never got beat up. That character was a composite--partly fiction and partly a kid I knew at school. It's not my personal story, but that's what the media wanted."